Flip-up auto darkening welding helmet



FIG. 1 is a top, front, right side perspective view of a flip-up auto darkening welding helmet in a first state showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a right elevational side view thereof;

FIG. 7 is a left elevational side view thereof;

FIG. 8 is a top, front, right side perspective view of the flip-up auto darkening welding helmet in a second state;

FIG. 9 is a front elevational view thereof;

FIG. 10 is a rear elevational view thereof;

FIG. 11 is a top plan view thereof;

FIG. 12 is a bottom plan view thereof;

FIG. 13 is a right elevational side view thereof; and,

FIG. 14 is a left elevational side view thereof.

The broken lines shown in the drawings represent portions of the flip-up auto darkening welding helmet that form no part of the claimed design. 

CLAIM The ornamental design for a flip-up auto darkening welding helmet, as shown and described. 